I use the Bluetooth tuning knob as a VFO tuning knobwith built in PTT that Markus recommends for the iPhone/iPad Using SmartSDR iOS from FlexWorks great
The unit is the Griffin PowerMate on EBay
It a Silver tuning Knob runs via Bluetooth
With my FlexRadio Remote !!!

Hi
All the options / controls utilise the iPads touch screen you just tap where you want to listen or or drag the bar to the correct frequency.
It's just the same as smartsdr but touch instead of a mouse
Regards
Mark
M0ZSS

I have an adapter for my heil proset but didn’t have with me. The internal mic is way To sensitive with all the background noise to operate. You can play around with the settings but as Howard said a very quite room is required. An easy test is just tap on the shack desk and that sound will be transmitted right along with my audio. Anyway tried a Yamaha CM-500 but got much better results with the Heil Proset. For either my PC or IPad when running remote.

I use my BlueParrot Bluetooth BT450-XT Noise Canceling
Headset with Mic in noisy locations works great
Used in Conventions, meeting halls, works great
No background noise with my iPhone/iPad with
My FlexRadio when Remote
Worth the money spent !
Found on Amazon
73 Mike